Piston construction



Oct. 10, 1933. '.1. F. BLESER PIsToN CONSTRUCTION Filed July 24. 1931 Patented Oct. 10, 193:3`

UNITED STATES PATEN oFFICE i 1,929,475 l PIsToN CONSTRUCTION v Joseph F. Bleser, Springeld, Ill. K Application July 24, 1931. V'Serial 190,552,855 l 9 claims. (cl. 999-4) l d a manner to be driven thereby when the pistonsare moved longitudinally in their respective cyl- Vinders. One object of the present invention is to provide a piston having anti-friction means associated therewith and having means for securing the anti-friction means against relative move-- inent with respect to the piston.

Another object of the invention is to providea piston having a plurality of anti-friction members mounted in and spaced longitudinally of the piston, and having means directly associated with the supporting means of the anti-friction 20. members for securing and retaining the members in fixed relative position with respect to each other.

A further object of the invention is to provide "'.fa piston formed of a plurality of relatively adjustable aligned parts or members having antifriction thrust devices mounted in the vrespective members, and wherein adjustable means are provided for securing the respective members to f gether and for directlyconnecting said anti-friction devices to each other.

A still further object of the invention is to improve devices ofthe character described in sundry details hereinafter referred to andpar- Aticularly pointed out in the appended claims.

One embodiment of the present invention is shown for illustrative purposes in the accompanying drawing in which,

Fig. 1 is a longitudinal sectional View of a piston "embodying features of the present invention;

Fig. 2 is a fragmentary longitudinal sectional view taken on thev line 2 2 of Fig. 1; and

Fig. 3v is a transverse sectional view of the piston taken substantially as indicated by the line 3-4-3 of Fig. l. Y y Y The present invention `is'an improvement on the piston construction described and claimed in my copending application iiled December 15, 1930, Serial No. 502,429, and the type of engine to which the present invention'is particularly adapted for use is fully described in my cepending application filed October 20; 1928, Serial No. 313,901, thesaid engine being of the cam type in which a rotatable engine shaft is mounted in frame members, and is provided with a cam adapted to be operatively related to a plurality end portions or members 9 and 10 of substantially like construction adapted to be positioned end to end as shown in Fig. 1 in the drawing, 65 and to be secured together by means of bolts 11 Y 4provided with screw threaded nuts 12v adjacent their end portionsfor drawing the members 9 and 10 toward each other, the members 9 and 10 being provided with hand holes 13 by which 70 t access to the nuts 12 may be obtained for the purpose above described.

The'end members are of substantially hollow construction as shown in Figs. land 2 of the drawing, thereby contributing to their lightness, 75 theA outer ends ofthe pistons being strengthened by means ofribs 14 extending transversely'across the interior of the pistonv heads. The endmem-V bers 9 and 10 are each provided with anti-friction rollers 16, the rollers being suitably spaced from eachy other vadjacent theY inner ends. of the members 9 and 10 and adapted to receive Ythe rim of va cam 17, a fragment of which is shown positioned between the rollers 16 in Fig. 1 of the n?, drawing, the rollers 16 engaging opposed faces 85 of the cam 17 in a manner't-o rotate the cam and shaft on which it is mounted when the Apistons are 'moved longitudinally of their respective cylinders under the iniiuence of an explosion or pres ,f1

surewithin the head of the cylinders as is common practice in engines of the type above referred to. 1 To permit of the arrangement above described,

one sideof the members 9 and lil-adjacent their inner ends is cut away as indicated at 18, thereby i providinga recess in one side of the. piston whereby the periphery of the cam 1'7 may'intersect the periphery of the piston and permit suitable" engagement of the rollers 16 with lthel opposed faces of the cam.

VIn the construction shown, each yof the rollers l 16 comprises an annular memberhaving a channel 19 formed in its inner side, andsuitably po sitioned within the annular member is a ref :t tainer 20 having a plurality of annularly spaced 105 radially disposed apertures 21 formedv therein, adapted to receiverollers 22 in a manner to permit one side of the rollers to extend into the channel 19, and the opposite side of thel rollers Y to protrude inwardly from the inner face of the 110 retainer 20. Thus it will be observed that the annular member or roller 16 provides an outer race for the rollers 22.

Positioned within the rollers 22 is a bearing cone 23 having an outwardly extending annular flange 24 at one end adapted to engage one of the ends of the rollers 22, and at the opposite end of the cone is a ring 25 adapted to engage the opposite ends of the rollers 22.

their bearings in the piston members -9 and 10, respectively, hollow shafts 26 and 27 are positioned within the cones 23 and rings 25 and pistons.

For varying the distance between adjacent faces of the rollers 16 in a mannerrto provide efficient cooperative relationship between ,the

rollers 16 and the opposed faces of the lcamv 17, a plurality of shims 30 are positioned between the'ad-jacent ends ofthe members 9 and10 and heldinplace byfthe bolts 11 passing `through apertures formed in the shims. Thus it will Mbe observed that by adding or removing one or moreshims, the space between adjacent faces of1the rollers 16 may bevaried to properly position vthem with respect to the cooperating faces of the caml7.

M `Invthe actual operation of devices of the character above described, it has been yfound that tremendous force or thrust .is exerted between the-camv17 and rollers 16,v and that owing to the inertia of the .piston structure, particularly Wat the ends of :its stroke, there is grave danger of breaking or `rupturing one or the otherv of To obviate the necessity of adding material to4 the-members 9 and 10, and torelieve the membersfrom a considerable portion of the strain orforce exerted bythe cam 17 against the rollers A16,-and at thesame time obtaina desirable degree.1of.strength in the piston structurefas a whole,` I provide a tie rod -31 adapted to connectthe hollow shafts 26 and 27 of the respective.

Y anti-friction. rollers 16 lsecurely together, and also adapted to be' positioned closely adjacent the rollers 16-in=a manner tol most efectually re.

ceive the strain exerted thereon by the cam 17.

Infthe present arrangement, one end of the tie rod 31 extends throughan aperture 32 formed inlone -of-the bosses29 of thel member 10 and through. anlaperture 33 'formed in the hollowv shaft 27, the said end of the rod 31within the shaft 27-being screw threaded and provided with a shoulder. 34 against which a threaded nut 35 maybe positioned, and, if desired, a spacing Washer. 36 may be positioned between the nut 35wand the inner face of the hollow shaft 27.

lThe opposite end of the tie rod 31 extends through `anaperture '37 formed in one of the bosses-28 o f the member 9 and throughan aperture 38formedin the hollow shaft 26, the said opposite end of the tie rod -3'1 being screwthreaded to receive a nut 39 which may be drawn down-tightly against a Yspacing washer 42.1 po- For supporting theanti-friction rollers lfand the inner ends of said members, and means indesitioned between the nut and the'inner face of the hollow shaft 26, thereby serving to draw the hollow shafts 26 and 27 toward each other and to retain the shafts and associated anti-friction members against relative displacement with respect to the piston members 9 and 10 and with respect to each other, it being understood that when the nut 35 is brought into engagement with the shoulder 34, the tie rod 31 may be held against Irotation while the nut 39 at the opposite end of the rod may be drawn down as tightly as .may-be found desirable, and locked against Vaccidental displacement by a cotter pin 40 or suitably mounted in bosses 28 and 29 formed f 15 respectively on the members 9 and 110ioffthe-f.;

other suitable securing means.

It 'willbe observed that when shims, such as those designated by the numeral 30 are added or removed =to-zprovide proper adjustment between the cam17andinner or adjacent faces of the rollers 16, the nut`39 by reason vof its screwthreaded connection with the tie rod 31 provides suitable adjusting means for securing the hollow shafts 26 and 27 together regardless of whether more or less shims-are positioned between the adjacent ends of the piston members 9 and 14).

Inpractice, the anti-friction rollers 16 and cam 10Q 17 are relatively adjusted with respect to each other in a manner to provide the least possibleclearance between the cam and rollers at all times, thereby avoiding a pounding action between the Y rollers and cam when the movement of the piston 10 is reversed, and Linder such circumstances, it will Vbe observed, from the foregoing description, that when a force or thrust is exerted by one side of the cam -17, for example, against the'roller 16,` mounted on the hollow shaft 27, the force, in- 11()n stead of being transmitted to the piston member f- 10, will be taken up `by the tie rod 31 owing to its' connection with'thehollow shaft26 on which the other .anti-friction roller 16 is mounted and which bears against the opposite side :of the cam 17.11%', Thus, it will be noted that the force or` thrust exerted on one of the rollers 16 instead of being transmitted to its associated piston memberwill" beresisted by the opposite working face of the cam through the anti-friction -roller associated 12()^ therewith'and the tie rod connecting the shaftson which the-respective anti-friction rollers are mounted.

It will be1observed also that the tie rod 31` -serves to 'hold the hollow shafts 26 and 27 against 12@i rotation and against longitudinal movement with 1 respect to the members 9 and 10.

Obviously, the presentinvention is not limited to the precise construction and arrangement shown and described as the same `may be various- 13g),a ly modified within the scope of the claims annexed Y- @ff hereto.v

What I claim as newand desire to cover by Lettersy Patent is:

1. Ina piston, the'combination of'a plurality of -13 separable aligned end members, means witliin` 12 the peripherythereof for securing the ymembers f together, 4anti-friction means mounted in said members andspaced fromy eachother adjacent pendentof saidgsecuring; means for connectingsaid lanti-friction means together for preventing relative displacement thereof 2. Ina piston, the combination of a pluralityof aligned end members, means for securing the members together, anti-friction means mounted` W inthe respective members, means positioned between the adjacent ends of said members for varying'. the distance between adjacent faces of` said anti-friction means, and adjustable means inde- 159* pendent of said securing means for connecting said anti-friction means together for preventing relative displacement thereof.

3. In a piston having aligned end portions, the combination of a plurality of shafts mounted in the respective end portions, anti-friction rollers mounted on said shafts, and adjustable means connecting said shafts for securing the shafts and rollers against relative displacement with respect to each other.

4. In a piston having aligned end portions, the combination of a plurality of shafts mounted in the respective end portions, anti-friction rollers mounted on said shafts, and adjustable means directly connected to said shafts adjacent said rollers for securing the shafts and rollers against relative displacement with respect to each other.

5. In a piston having aligned end portions, the combination of a plurality of shafts mounted in the respective end portions, anti-friction rollers mounted on said shafts, a tie rod extending through a portion of said shafts, and means operatively related to the ends of said rod for securing the shafts and rollers against relative displacement vvith respect to each other.

6. In a piston having aligned end portions, the combination of a plurality of shafts mounted in the respective end portions, anti-friction rollers mounted on said shafts, a tie rod extending through said end portions and said shafts, and means operatively related to the ends of said rod for securing the shafts and rollers against relative displacement with respect to each other.

'7. In a piston having aligned end portions, the combination of a plurality of hollow shafts mounted in the respective end portions, anti-friction rollers mounted on said shafts, a tie rod extending through a portion of said shafts, and means operatively related to the ends of said rod within said shafts for securing vthe shaftsvand rollers against relative displacement with respect to each other.

8. In a piston having aligned end portions and bosses associated therewith, the combination of a pair of hollow shafts mounted in the bosses of the respective end portions, anti-friction rollers mounted on said y shafts', a tie `rod l extending through a portion of said bosses and shafts closely adjacent said rollers, and adjustable means operatively related to the ends of said rod within said shafts for securing the shafts and roller against relative displacement with respect to each other.

9. In a piston having aligned end portions, the combination of a pair of hollow shaftsmounted in the respective end portions, anti-friction rollers mounted on said shafts, a tie rod extending through a portion of said shafts closely adjacent said rollers, and adjustable means operatively related to the ends of said rod within said shafts for securing the shafts and roller against relative displacement with respect to each other.

JOSEPHv F. BLESER. 

